The Claim
In two healthy adult individuals, daily supplementation with 10,000 IU of vitamin A for approximately 21 days was associated with increased apparent absorption of a subsequent oral dose of [14C]beta-carotene, as measured by urinary excretion over a 30-day collection period, with absorption rising from 57% to 74% in one subject and from 52% to 75% in the other.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking a lot of vitamin A every day for about three weeks might help two healthy people absorb more beta-carotene from their food, based on how much showed up in their urine over the next month.
See the scientific wording
In two healthy adults, daily supplementation with 10,000 IU of vitamin A for approximately 21 days was associated with increased apparent absorption of a subsequent oral dose of [14C]beta-carotene, as measured by a rise from 57% to 74% in one subject and from 52% to 75% in the other over a 30-day collection period.
What the research says
1 studyThe study gave people vitamin A for 21 days and then checked how well their bodies absorbed beta-carotene. It found absorption improved, just like the claim says.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.